year 8 maths

534 Chapter 9 Data collection, representation and analysis
4 In a Year 4 class, the results of a spelling quiz are
presented as a dot plot.
a What is the most common score in the class?
b How many students participated in the quiz?
c What is the range of scores achieved?
d What is the median score?
e Identify the outlier.
f What is the mode?
g Are there any gaps in this set of data?
Spelling quiz results
0 1 2 3 4 5 6 7 8 9 10
Score out of 10
5 Joan has graphed her height at each of her past five birthdays.
Height (cm)
180
160
140
120
100
80
60
40
20
0
Joan’s height at different birthdays
8 9 10 11 12
Joan’s age (years)
a How tall was Joan on her 9 th birthday?
b How much did Joan grow between her 8 th birthday and 9 th birthday?
c How much did Joan grow between her 8 th and 12 th birthdays?
d How old was Joan when she had her biggest growth spurt?
Example 4
6 Draw a column graph to represent each of these boys’ heights at their birthdays.
a Mitchell b Fatu
Age (years) Height (cm)
8 120
9 125
10 135
11 140
12 145
Age (years) Height (cm)
8 125
9 132
10 140
11 147
12 150
Cambridge Maths NSW
Stage 4 Year 8 Second edition
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
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